#pragma once
#include<stdio.h>
#include<assert.h>
#include<stdlib.h>
typedef struct tree
{
	int val;
	struct tree* left;
	struct tree* right;
}tree;
void creat(tree** root, int val);
tree* find(tree* root,int val);
void push(tree** root, int val);
void mid(tree* root);